[Asdf-devel] Why won't accept relative pathnames in source-registry?

Hi ASDF developers, I wanna ask a question about the specification of source-registry. ASDF doesn't allow relative pathnames in source-registry string intentionally. https://github.com/drmeister/asdf/blob/master/source-registry.lisp#L136 It seems the line has long history, however, why it won't accept relative pathnames? I think it would be useful when adding the current working directory to the source registry like: # doesn't work CL_SOURCE_REGISTRY=. sbcl --eval '(princ (asdf:system-source-directory :myapp))' Thanks, Eitaro Fukamachi